$tagColor: #2d8536, #c55c23, #5a5a5a, #71aed2, #c5b423, #693eb1;
@mixin rightTags() {
    .tag-list {
        background: #f2f3f4;
        padding: 21px 0;
        li {
            float: left;
            width: 33.33%;
            padding: 9px 10px;
            -webkit-box-sizing: border-box;
            -moz-box-sizing: border-box;
            box-sizing: border-box;
            a {
                font-size: 15px;
                line-height: 1;
            }
        }

        @for $i from 1 to 30 {
            li:nth-of-type(#{$i}) {
                a {
                    color: nth($tagColor, random(6));
                }
            }
        }
    }

}